15599647440 has 480 divisors, whose sum is σ = 61967033856. Its totient is φ = 3613040640.

The previous prime is 15599647429. The next prime is 15599647451. The reversal of 15599647440 is 4474699551.

15599647440 is a `hidden beast` number, since 1 + 5 + 599 + 6 + 4 + 7 + 4 + 40 = 666.

It is an interprime number because it is at equal distance from previous prime (15599647429) and next prime (15599647451).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 4294425 + ... + 4298055.

Almost surely, 2^15599647440 is an apocalyptic number.

15599647440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15599647440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30983516928).

15599647440 is an abundant number, since it is smaller than the sum of its proper divisors (46367386416).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

15599647440 is a wasteful number, since it uses less digits than its factorization.

15599647440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3689 (or 3671 counting only the distinct ones).

The product of its (nonzero) digits is 5443200, while the sum is 54.

The spelling of 15599647440 in words is "fifteen billion, five hundred ninety-nine million, six hundred forty-seven thousand, four hundred forty".